how show greeting in top header?

[ebloger]

in default , the greeting is show only in the center of home page , i try to copy /plaste the code
<?php if (SHOW_CUSTOMER_GREETING == 1) { ?>
<h2 class="greeting"><?php echo zen_customer_greeting(); ?></h2>
<?php } ?> to tpl_header.php
and then the home page show hello XXXX(a custom name) but in others page
the code does not work.
it show TEXT_GREETING_GUEST ...